Know what's in the product.

What the lab report, the batch number, and the percentages on the package actually tell you.

• How to read a cannabis COA→A certificate of analysis tells you what is actually in the jar. Here is how to read one section by section, and which numbers are worth your attention.
• Why the same strain can feel different→Two jars with the same name on the label can carry very different chemistry. Here is where that variation comes from and what to look at instead.
• What terpene percentages actually mean→Total terpene content, individual percentages, and what counts as high. A plain-language guide to the second half of the lab report.
• What a batch number tells you→The batch or lot number is the link between the package in your hand and the lab report that describes it. Here is why it matters more than the strain name.

The aromatic compounds that vary most between two products sharing a strain name.

• Myrcene→Myrcene is the most common terpene in cannabis. What it smells like, where else it shows up, and what the research does and does not establish.
• Limonene→The citrus terpene, and the second most common in cannabis. What limonene is, how it is measured, and how to track your own response to it.
• Linalool→The terpene cannabis shares with lavender. What linalool is, the concentrations it typically appears at, and what that means for your own logging.
• Caryophyllene→The peppery terpene, and the only one known to bind a cannabinoid receptor directly. What beta-caryophyllene is and why it is unusual.
• Pinene→The pine terpene, reported as two separate compounds on a lab report. What alpha- and beta-pinene are, why the distinction matters, and what the clarity claim rests on.
• Terpinolene→Sweet, herbal, and rarely dominant. What terpinolene is, the COA lines it gets confused with, and why the preclinical work sits oddly beside its reputation.
• Humulene→The hops terpene, and the one most often confused on a lab report. What humulene is, why some labs call it alpha-caryophyllene, and how far the research actually goes.

Beyond the THC number on the front of the package — the ratios, the totals, and the minor compounds that sit under them.

• THC:CBD ratios explained→How to read the ratio on a package, what balanced and high-CBD products mean in practice, and why total cannabinoid content matters alongside it.
• CBD→How Total CBD is calculated, why the pharmaceutical evidence does not transfer to a retail product, and the drug-interaction question worth asking a pharmacist.
• CBN→CBN is what THC becomes with age, which makes it a freshness signal on a lab report. Also the compound whose sleep reputation rests on the thinnest evidence in the plant.
• CBG→The precursor the plant builds THC and CBD from, and why so little of it survives to harvest. What the early human research shows and what it does not.